package net.lzzy.practices.services;


import net.lzzy.practices.entities.User;
import net.lzzy.practices.repositories.UserProjection;
import net.lzzy.practices.repositories.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.UUID;

/**
 *
 */
@Service
public class UserServiceImpl implements UserService {
    private final UserRepository repository;

    @Autowired
    public UserServiceImpl(UserRepository repository) {
        this.repository = repository;
    }

    @Override
    public User check(String userName, String password) {
        return repository.findUserByUserNameAndPassword(userName, password);
    }

    @Override
    public boolean isUserNameOccupied(String userName) {
        return repository.countByUserName(userName)>0;
    }

    @Override
    public User register(User user) {
        return repository.save(user);
    }

    @Override
    public List<User> get() {
        return repository.findAllByOrderByUpdateTimeDesc();
    }

    @Override
    public List<User> get(int page, int size) {
        return repository.findAllByOrderByUpdateTimeDesc(PageRequest.of(page, size));
    }

    @Override
    public User getById(UUID id){
        return repository.findById(id).orElse(null);
    }

    @Override
    public Integer count() {
        return repository.countAllBy();
    }

    @Override
    public List<User> search(String kw) {
        return repository.findByQuery(kw);
    }

    @Override
    public List<User> getApplying(boolean applying) {
        return repository.findUserByApplyTeacherOrderByUpdateTimeDesc(applying);
    }

    @Override
    public User approveTeacher(UUID id) {
        //findById是eager,getById是延迟查询，事务处理
        User user=repository.findById(id).orElse(null);
        if(user!=null){
            user.setType(User.TYPE_TEACHER);
            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;

    }

    @Override
    public User declineTeacher(UUID id) {
        User user=repository.findById(id).orElse(null);
        if(user!=null){
            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;
    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public User banUser(UUID id) {
        User user=repository.findById(id).orElse(null);
        if(user!=null){
            user.setType(User.TYPE_BANNED);
            user.setApplyTeacher(false);
            return repository.save(user);
        }
        return null;
    }

    @Override
    public String getSalt(String userName) {
        List<UserProjection> salts=repository.findUserByUserName(userName);
        if(salts==null||salts.size()==0){
            return "";
        }
        UserProjection projection=salts.get(0);
        if(projection==null){
            return "";
        }
        String salt=projection.getSalt();
        return salt==null?"":salt;
    }

}
